Structural Changes in the Ring Seine Fishing System. 4.1 Introduction
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1 Structural Changes in the Ring Seine Fishing System 4.1 Introduction In purse seines, a pursing arrangement is incorporated in order to close the net at the bottom after surrounding a shoal of fish. This facilitated the operation of net in deeper waters. Purse seines are the predominant type of surrounding nets which are generally operated in the surface area. Surrounding nets are roughly rectangular walls of netting rigged with floats and sinkers which after detection of the presence of fish are cast to encircle the fish school. Purse seine fishing is one of the most aggressive, efficient and advanced fishing methods. It is aimed mainly at catching dense, mobile schools of pelagic fish and includes all the elements of searching, hunting and capture. Boat seines and shore seines are age old fishing methods of Kerala. According to Pillai et al. (2000) the regional names of boat seines have been documented as, arakollivala, ayilakollivala, choodavala, discovala, deppavala, ringvala, kudukkuvala, thanguvala, kollivala, koruvala, mathikollivala and paithuvala. According to FAO (1984), thanguvala is a lampara-type net of 150 m length and operated from beach landing canoes 91
2 Chapter 4 known as thanguvallams. These boats had dimensions of 15m length, 1.4m breadth, and 0.85m depth. The first trial of the motorization of thanguvallams was made by the Indo-Norwegian Project in Neendakara in This trial was unsuccessful due to the vibration of the installed inboard diesel engine which caused leaking problems in the stitched canoes. Moreover, the high operating costs of a petrol outboard engine was also not acceptable to the fishermen. In September 1980, new motorisation trials were started by the Kerala Fishermen Welfare Corporation in Purakkad near Alappuzha with inboard diesel engine of 9 hp, outboard diesel engine of 5 hp, and outboard kerosene engine of 7 hp. With continuous improvement, the motorisation program became a success and it spread along the entire coast of Kerala. Commercial purse-seine fishing started during the late seventies in Cochin, Kerala (Jacob et al., 1987) and the process of large scale motorisation of country craft began in the early eighties. The structure of the ring seine has many features similar to the purse seine. The ring seine, like the purse seine, has purse rings along its lower edge. Some of the chief structural differences between the ring seine and the purse seine are that the purse seine is made of comparatively heavy webbing, is practically uniform throughout its entire length, and is square on the ends; while the ring seine, is made of light webbing, is gathered on the ends. It was operated from a plank built canoe of 15 m length propelled by a 9.9 hp engine. Although banned under the KMFR Act 1980, which was later revoked, the ring seine is immensely popular in Kerala fisheries. The emergence of the ring seine caused two major artisanal gears of Kerala namely koruvala and kollivala to become obsolete (Alagaraja et al., 1994). 92
3 Structural Changes in the Ring Seine Fishing System The ring seine fishery first introduced in Kerala and quickly spread to other parts of the country. Rohit & Naik (1998) reported the information about the ring seine introduced in Malpe fisheries harbor, Karnataka. Mohanraj et al. (2011) reported the introduction of ring seine boats for commercial exploitation of pelagic fish resources of Puducherry coast. Vijaykumaran & Chittibabu (2005) reported 15-20mm mesh sized ring seine in Orissa coast. Shiledar (2009) reported the introduction of mini purse seine in the MH-1 zone of Maharastra coast. Burayya (2006) reported introduction of ringvala (ring seine) along Kakinada coast made of silk yarn having a total length of about m and breadth of about m. Ring seines contribute 5.2 % of Karnataka and 8% of Goa total marine landings during 2010 (CMFRI, 2011). Rajeswari et al. (2013) elaborated the three types of ring seines operated in the Andhra Pradesh coast. Ring seines with mm mesh size were studied by Arur et al. (2014) in Andaman and Nicobar Islands. Presently the ring seine fishery is spread among the entire country except West Bengal and Lakshadweep Islands. 4.2 Materials and Methods The analysis of data obtained under the study Regional variations in design of ring seines and their operation (Chapter-3) shows that the craft, gear and method of operations has evolved over the period from The present status was obtained from the survey conducted under this doctoral programme. This data on craft and gear was then compared with the work of Panicker et al. (1985); D Cruz (1998); Krishna et al. (2004); Edwin et al. (2010); Edwin et al. (2014b); etc. 93
4 Chapter Result and Discussion Changes in the Fishing System It is observed that there has been a drastic increase in the size of the gear with a commensurate increase in size of the fishing vessel and horsepower of the engine. The dimensions of the gear rose incrementally over the years and the size of the vessel and horsepower also increased subsequently Dimensions of the Gear and Mesh Sizes The gear is a wall of nylon knotless webbing and is mainly used to catch sardines, mackerel and small fishes like anchovy. The mini- purse seine introduced by CIFT, which is a modified innovative version of the thanguvala, had an overall length of 250 m and a depth of 15 m and 33 m at the wing end and the bunt respectively (Fig. 4.1) and pursing was done with the help of rings (Panicker et al., 1985). The size of gear as reported by Edwin and Hridayanathan (1996) in south central Kerala region was 630m and depth 100 m with a mesh of mm (Fig. 4.2). The ring seine of smaller mesh size (8-10 mm) is used to target small fish like anchovy and operate in shallow waters. The report by D Cruz (1998) showed that the gear had grown in dimensions and due to the large size of the nets, trolleys are used for transportation of the gear. Large ring seines up to 900m length and 90 m depth were reported by Krishna et al. (2004) from Thrissur district of Kerala. Edwin et al. (2010) reported that for a gear with mesh size of 20 mm, length ranged from 600 to 1000 m, depth ranged from 83 to 100 m and weight ranged from 1500 to 2500 kg, were operated from a fishing vessel of L OA feet long powered by inboard engine, hold a crew of (Fig. 4.3). Change in Dimensions of the gear and targeted species are given in Table 4.1. In the past thirty years, the size of the ring seines have grown at least three to four times in proportion to the extent of about 1500 m in length and 100m in depth in Cochin area (Fig.4.4 & Fig.4.5). 94
5 Structural Changes in the Ring Seine Fishing System Fig 4.1 Typical design of Ring seine in 1985 (Source: Panicker et al., 1985) Fig 4.2 Typical design of Ring seine in 1996 (Source: Edwin & Hridayanathan 1996) 95
6 Chapter 4 Fig 4.3 Typical design of Ring seine in 2010 (Source: Edwin et al., 2010) Fig 4.4 Typical design of Ring seine in
7 Structural Changes in the Ring Seine Fishing System Length of ring seine gear (m) Fig 4.5 Increase in ring seine size of Kerala ( ) Table 4.1 Dimensions of the gear and targeted species Source Length (m) Depth Mesh Size Webbing (m) (mm) Material Targeted Species Panicker et al.(1985) Nylon Sardine, Mackerel D Cruz (1998) Nylon Sardine, Mackerel Krishna et al. (2004) Nylon Sardine, Mackerel Edwin et al. (2010) Nylon Anchovy, Sardine Edwin et al. (2010) Nylon Sardine, Mackerel Edwin et al. (2014b) Nylon Sardine, Mackerel Size of Ring Seiner The craft from which the erstwhile boat seine was operated and which later was used for the introduction of the mini-purse seine reported by Kuriyan et al. (1962) had an average length of m and breadth of m. 97
8 Chapter 4 These fishing craft are basically plank built, deckless canoes where fishermen sit and operate the gear. Studies conducted by the South Indian Federation of Fishermen Societies (SIFFS) indicate that between 1985 and 1988 the length of ring seine craft increased to m in the Aleppey region. The maximum breadth of the craft was 1.30m and depth of 1.25m m. 30 L OA of Ring seuner (m) Fig 4.6 Increase in size of ring seiner ( ) The service life of the vessel is 2-6 years. Since majority of the vessels are in the size range of m, they cannot be beach landed after operation as they used to with their smaller craft. The increase in size of the ring seiners during the last three decades is shown in Fig The vessels are left anchored at sea and the vulnerability to damage in rough weather has increased. The craft is exclusively designed for the ring seine operation and the fishing season of ring seine is restricted to six months in a year and large size of the canoes restricts its use for alternate types of fishing. Lifesaving, 98
9 Structural Changes in the Ring Seine Fishing System firefighting appliances, fish storage and crew accommodation facilities are also lacking on board these fishing vessels. The increase in the size of fishing units which led to increase in fishing effort has been first manifested in the ring seine fishery of Kerala. In order to accommodate the huge gears, the size of craft also increased two fold in these areas and number of craft forming a unit increased four times Horsepower of the Fishing Units The ring seiners used 8 to 15 hp engines for propulsion of the craft (D Cruz, 1998). However, in certain cases, two engines are used in a single unit. These are necessitated because of large gear, crew members and bulky catch. Currently such vessels use single inboard engines of hp engines depending upon the size of the craft (Fig. 4.7). An all Kerala survey conducted by CIFT in 2013 shows that the fishermen are not satisfied with the power and performance of these engines and they are constantly on the lookout for more powerful marine engines (Edwin et al., 2014a). Large scale entry of imported engines into the marine fishing industry with promises of delivering more power at a lesser price compared to the available branded marine engines in the market, attracts the fishermen. Shortage of experienced mechanics and scarcity of spare parts of imported engines are some of the problems faced by fishermen. The availability of powerful engines also fuelled the growth of the ring seine units. The inboard engines used by ring seiners are often refurbished truck engines, resulting in high fuel consumption. The carrier vessel which accompanies the main vessel is fitted with either one engine of 25 hp or two 99
10 Chapter 4 engines of 25 or 40 hp or three engines of 9.9 hp. Small winches are used to facilitate hauling of the purse line. Engine power (hp) Fig 4.7 Increase in engine power ( ) 4.4 Conclusion The emergence of the ring seine caused two major artisanal gears of Kerala namely koruvala and kollivala to become obsolete (Rajan, 1993; Alagaraja et al., 1994). With the ring seine replacing the traditional koruvala, the scale of operation has substantially increased. The size of the thanguvallom has been continuously increasing in order to accommodate larger gear. The ring seine belt between Quilon and Central Ernakulam districts has changed to two boat operation, one of which a smaller thanguvallom accompanies the larger one as a carrier boat engaged for transfer the catch to shore. Northern Ernakulam, Trichur and Malappuram districts have changed from dugout canoe kollivala fishing 100
11 Structural Changes in the Ring Seine Fishing System operation to plank built thanguvallom ring seine fishing and started to use small thanguvallom as carrier vessel. In Malappuram, boat seines are converted into single boat ring seine. Kasaragod fishermen started ring seine operation with four dugout canoes in 1986 and is called ranivala. Northern Calicut region and Kannur adopted the ranivala instead of kollivala and the southern part of Calicut has adopted thanguvallom ring seine. Finally the ring seine belt spread to entire Kerala with ranivala in northern part and thanguvallom ring seine in southern part. Presently the Kerala ring seine belt extends from Muthalampozhi in Thiruvananthapuram district to Talapady in Kasaragode district (Edwin & Das, 2015). Each region has its own peculiarities in construction and operation of the gear. Gear with mesh size of mm nylon knotless webbing is mainly used to catch sardines and mackerel mm mesh size ring seine (choodavala) is used to target small species like white baits, sardines and operate in shallow waters. The overall length of this gear ranges from 300 m to 1200 m with a depth range of 45 m to 110 m. Thanguvalloms of feet long with a crew size of operated with inboard engine are being currently used for ring seine operation (Edwin & Das, 2015). The ring seines of Kerala now contribute to 51% of the total marine fish landings of the state (CMFRI, 2015) 101
12 Chapter 4 24 m steel ring seiner 1500 m ring seine IBM ring seine engine 1200m ring seine under operation Juvenile sardine landed in ring seine Plate- 5 Large sized ring seine unit and juvenile landing 102
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